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HT45F4MA bảng dữ liệu(PDF) 100 Page - Holtek Semiconductor Inc |
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HT45F4MA bảng dữ liệu(HTML) 100 Page - Holtek Semiconductor Inc |
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100 / 145 page  Rev. 1.20 100 De�e��e� 1�� 201� Rev. 1.20 101 De�e��e� 1�� 201� HT45F4MA/HT45FH4MA/HT45FH4MA-1 Power Bank Flash MCU HT45F4MA/HT45FH4MA/HT45FH4MA-1 Power Bank Flash MCU Summary of A/D Conversion Steps ThefollowingsummarisestheindividualstepsthatshouldbeexecutedinordertoimplementanA/D conversionprocess. • Step1 SelecttherequiredA/DconversionclockbycorrectlyprogrammingbitsADCK2~ADCK0inthe ADCR1register. • Step2 EnabletheA/DbyclearingtheADOFFbitintheADCR0registertozero. • Step3 SelectwhichchannelistobeconnectedtotheinternalA/Dconverterbycorrectlyprogramming theACS4~ACS0bitswhicharealsocontainedintheADCR1andADCR0register. • Step4 SelectwhichpinsaretobeusedasA/Dinputsandconfigurethembycorrectlyprogrammingthe ACE7~ACE0bitsintheACERLregister. • Step5 Iftheinterruptsaretobeused,theinterruptcontrolregistersmustbecorrectlyconfiguredto ensuretheA/Dconverterinterruptfunctionisactive.Themasterinterruptcontrolbit,EMI,and theA/Dconverterinterruptbit,ADE,mustbothbesethightodothis. • Step6 TheanalogtodigitalconversionprocesscannowbeinitialisedbysettingtheSTARTbitin theADCR0registerfromlowtohighandthenlowagain.Notethatthisbitshouldhavebeen originallyclearedtozero. • Step7 Tocheckwhentheanalogtodigitalconversionprocessiscomplete,theEOCBbitintheADCR0 registercanbepolled.Theconversionprocessiscompletewhenthisbitgoeslow.Whenthis occurstheA/DdataregistersADRLandADRHcanbereadtoobtaintheconversionvalue.Asan alternativemethod,iftheinterruptsareenabledandthestackisnotfull,theprogramcanwaitfor anA/Dinterrupttooccur. Note:Whencheckingfortheendoftheconversionprocess,ifthemethodofpollingtheEOCBbit intheADCR0registerisused,theinterruptenablestepabovecanbeomitted. Theaccompanyingdiagramshowsgraphicallythevariousstagesinvolvedinananalogtodigital conversionprocessanditsassociatedtiming.AfteranA/Dconversionprocesshasbeeninitiated bytheapplicationprogram,themicrocontrollerinternalhardwarewillbegintocarryoutthe conversion,duringwhichtimetheprogramcancontinuewithotherfunctions.Thetimetakenforthe A/Dconversionis16tADCKwheretADCKisequaltotheA/Dclockperiod. |
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